yes addition is commutative so is multiplication but not subtraction
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Y+7=9 equals 2+7=9.
The answer is 144. The compound operator for (a) and (b) in each pair is a * (a+b). For 9 and 7, this is 9 x (9+7) = 9 x 16 = 144.
144 9+7 = 16 and 9*16 = 144
It is: -2+9 = 7
144 9+7 = 16 and 9*16 = 144